Isotropic characteristic classes
Compositio Mathematica, Tome 91 (1994) no. 1, pp. 67-89. 
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     title = {Isotropic characteristic classes},
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     publisher = {Kluwer Academic Publishers},
     volume = {91},
     number = {1},
     year = {1994},
     mrnumber = {1273927},
     zbl = {0836.57020},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1994__91_1_67_0/}
}
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Morvan, Jean-Marie; Niglio, Louis. Isotropic characteristic classes. Compositio Mathematica, Tome 91 (1994) no. 1, pp. 67-89. http://archive.numdam.org/item/CM_1994__91_1_67_0/

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